Revert "Merge pull request #12416 from ahocevar/eventtype-generics"

This reverts commit b6c143deb2, reversing
changes made to 7777821df5.

src/ol/source/Image.js

@@ -76,7 +76,6 @@ export class ImageSourceEvent extends Event {
  * Base class for sources providing a single image.
  * @abstract
  * @fires module:ol/source/Image.ImageSourceEvent
- * @extends Source<'imageloadend'|'imageloaderror'|'imageloadstart'>
  * @api
  */
 class ImageSource extends Source {

src/ol/source/Source.js

@@ -40,8 +40,6 @@ import {get as getProjection} from '../proj.js';
  * Base class for {@link module:ol/layer/Layer~Layer} sources.
  *
  * A generic `change` event is triggered when the state of the source changes.
- * @template {string} EventTypes
- * @extends BaseObject<EventTypes>
  * @abstract
  * @api
  */

src/ol/source/Tile.js

@@ -36,8 +36,6 @@ import {scale as scaleSize, toSize} from '../size.js';
  * Abstract base class; normally only used for creating subclasses and not
  * instantiated in apps.
  * Base class for sources providing images divided into a tile grid.
- * @template {string} EventTypes
- * @extends Source<EventTypes>
  * @abstract
  * @api
  */

src/ol/source/UrlTile.js

@@ -33,7 +33,6 @@ import {getUid} from '../util.js';
  * Base class for sources providing tiles divided into a tile grid over http.
  *
  * @fires import("./Tile.js").TileSourceEvent
- * @extends TileSource<'tileloadend'|'tileloaderror'|'tileloadstart'>
  */
 class UrlTile extends TileSource {
   /**